Buy.com has the 500GB Western Digital Elements external hard drive for $100 shipped, marked down from $140. (Around the web, this drive sells for $115-$140.) Now that Time Machine is compatible with any hard drive networked to an Airport Extreme, some of you might be interested in picking up something. This is the best deal that we could find, but we're sure you've seen better. See any deals?? [Dealhack]